Quarterly report pursuant to Section 13 or 15(d)

Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail)

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Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail) - Customer Concentration Risk [Member] - Total Revenue [Member]
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Customer A [Member]        
Revenue, Major Customer [Line Items]        
% of total revenues 30.00% 17.00% 25.00% 17.00%
Customer B [Member]        
Revenue, Major Customer [Line Items]        
% of total revenues   18.00% 12.00% 19.00%